empty function

To develop a custom control: 1, understand how view works  2, write subclass 3 Inheriting from view, add attribute  4 for custom view class, draw control  5, respond to User message  6, customize callback function     A, view structure principle the

Exercise 4.20A) legal, dereference ITER, first output the value of the object that ITER points to, and then move the position of the ITER point forward one;b) Illegal, *iter get a string, the string can not be self-increment;c) Illegal, the priority

PHP is a loosely typed programming language, and it is an indispensable step in a function to examine the "type" of the passed parameter value and whether the value is null or NULL. Type check Starting with PHP5, PHP allows type

What do you think of when the array is empty in our development process? The first thought should be the empty function, but it is not right to use the empty function to judge Null, because when the value is a multidimensional number, the empty

First, what is a memory leakA memory leak refers to a piece of allocated memory that cannot be used or recycled until the browser process ends. In C + +, memory leaks are a frequent occurrence because of the manual management of memory. And now

The topic is to do a and demo almost a meaning, give the hint should be very sufficient, including a variety of functions have. Using this method we can save an HTML file by mentioning how to detect a commit in two ways that PHP checks whether the

There are four kinds of event models in various browsers: the original event model, the standard event model, the IE event model, and a NETSCAPE4 event model, which is described in detail below. 1, there are currently four kinds of event processing

In general, when we write JavaScript, we like to first name an empty function (such as code 1), I feel this will consume some performance, and the code is written more. You can actually declare the function you want to write without first declaring

When using PHP to write a page program, I often use the variable handler function to determine the PHP page trailing parameters of a variable value is empty, at the beginning I used to use the empty () function, but found some problems, so instead

In C + +, the definition of a function is:Type name (P1,P2){stament};Where type is the return value of the function, name is the identifier of the function, and P1,P2 is the two parameter of the function, which is scoped only within the function

There are a number of ways to define classes in JS: 1. Factory mode Copy Code code as follows: function car () { var ocar = new Object; Ocar.color = "Blue"; Ocar.doors = 4; Ocar.showcolor = function () { document.write

JS Debug Series Directory:- If you look at 1, 22, you should have a preliminary understanding of the console, today we have a simple debugging.The three after-school exercises that were left yesterday are pretty much what we are going to talk

Objective: The coding style of the programming language is important for a long term maintenance software, especially in team collaboration. If a team uses a uniform coding style, it can improve the team's level of collaboration and productivity.

To prepare for the next chapter to analyze the animation process, look at some of the tools first. Where the queue tool is used frequently in animation processing. Jquery.fn. Queue ([QueueName] [, Newqueue]) | | ([QueueName,] callback) (Gets or

A memory leak is a piece of allocated memory that is neither available nor recyclable until the browser process finishes. In C + +, memory leaks are a frequent occurrence because of the manual memory management. And now popular in C # and Java and

After the configuration is complete, the login page will be completed. Because you have to write authentication information to a cookie after logging in, you must make a jump. Of course, do not jump, or do not write authentication information can

In the front-end development, often need to define the JS class. So in JavaScript, there are several ways to define classes, what are the differences? This article on the JS definition class of the six-way description is as follows (case description)

There are a number of ways to define classes in JS: 1. Factory mode Copy Code code as follows: function car () { var ocar = new Object; Ocar.color = "Blue"; Ocar.doors = 4; Ocar.showcolor = function () { document.write

Research for more than a year JS, also almost write a own JS library.I write this does not calculate the framework, is just a small JS tool library, so I use the name of the library.The main collection of I write JS when some of the commonly used

Introduction: Learning the object-oriented language (Java, C + +) of children's shoes are aware of the concept of object-oriented, and certainly know the characteristics of object-oriented language: encapsulation, inheritance and polymorphism, but